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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afe467b415ba6863c56656c8f6a3d77e4a1cca182a3c418b5613aedd1891bd92' 
  AND token = 'SzBoRa4Aaj64QGmVeiaii57B3E6WvHAlVl6w9QRoeJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}